Demos

 

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www.gchimneytech.com

May 2018

 

 

 

Introduction

 

 

 

Our company is controlling patents and Know-How of a solar technology named Hybrid PV+Parabolic Trough+Solar Chimney technology Details of this Hybrid technology are shown in our site www.gchimneytech.com

 

 

 

The Hybrid PV+Parabolic Trough+Solar Chimney technology is a maverick version of the conventional solar chimney technology where PV panels and Parabolic Troughs are hanged beneath the glassed roof of a greenhouse.

 

Electricity is generated during daylight by PV panels, and by the Air Turbines of the Solar Chimney using the Solar Chimney air up-drafting effect.

 

Electricity is generated after the sunset by the steam turbine of the parabolic trough system, using the stored thermal energy in the thermal storage tanks of the system.

 

The PV panels and the Parabolic Troughs are wind and dust protected inside the Greenhouse of the plant and the Solar Chimney Air up-drafting operation is used also for their cooling.

 

Solar Chimney can be constructed properly in order to be used as a cooling tower for the steam turbine operation of the parabolic trough CSP plant.

 

 

 

 

 

Our patented technology advantages

 

 

 

Undoubtedly PV power plants are the most suitable renewable energy system to solve the planet's energy demand without the side effects of climate change from the use of fossil fuels

 

 

 

PVs, however, have the following disadvantages:

 

 

 

  1. In all countries, electricity is also needed after the sunset, and solar PV plants must be able to operate after the sunset. Storage energy for after the sunset operation for PV plants is necessary and batteries have been proposed to solve this problem.

 

 

 

 However with current data, the proper Lithium-Ion batteries are expensive and the levelized cost of of uninterrupted electricity of a PV with storage plant (LCOE) is not less than 12 cents/KWh  (for latitudes near 350)

 

 

 

ThePV+Parabolic Trough+Solar Chimney technology is a cost competitive alternative aiming into lowering the LCOE below the 7 cents/KWh.

 

 

 

  1. Strong solar irradiation increases PV productivity, but as increasing their temperature reduces also their efficiency. Dust in sandy countries, sitting on the surface of PV panels is further reducing their performance.

 

 

 

The Solar Chimney Air up-drafting operation of the PV+Parabolic Trough+Solar Chimney plant is also used for the cooling of PV panels and Parabolic Troughs hanged beneath the glass roof of the Greenhouse.

The PV panels and the Parabolic Troughs of the PV+Parabolic Trough+Solar Chimney technology are wind and dust protected inside the Greenhouse.

 

 

 

 

 

The initial cost figures of a DEMO  Hybrid PV Parabolic Trough+Solar Chimney technology plant of 2.5 MW PV panels and 20,000 m2 parabolic trough surface area, inside a Greenhouse of 75,000 m2 supported by a Solar Chimney of 40 m height and 18 m diameter are following.

 

 

 

 

 

DEMO dimension rating and cost estimation

 

 

 

 

 

The Hybrid PV+Parabolic Trough+Solar Chimney technology is an maverick version of the conventional solar chimney technology, by which we can generate electricity by PV panels and Parabolic Troughs hanged up the roof of a proper greenhouse and by air turbines, using the solar chimney air up-drafting effect.

 

 

 

The proposed HPVSC power plant will comprise of a greenhouse of 75,000 m2 made of 2,500 cells of 30 m2 area each. Inside the greenhouse by the metal frame of the roof there will be hanged up 2,500 PV panels of rating power of 1 KW thus of overall nominal power of 2.5 MW and 2,500 parabolic troughs of 8 m2 each thus of a 20,000 m2 overall surface area.

 

 

 

The thermal oil of the system of Parabolic Troughs is transferring thermal energy to a set of proper thermal storage tanks by which after the sunset or whenever is necessary we can generate steam that will be used for the operation of a 1.5 MW steam turbine engaged to a proper electric generator.

 

 

 

The tempered glass panels of the roof are crystal clear of high solar transmittance that leave more than 90% of the solar irradiation to reach the PV panels and the parabolic troughs.

 

 

 

The greenhouse will be connected to a solar chimney of 40 m height and 18 m diameter that will up-draft the warm air of the greenhouse, cooling the PV panels and the parabolic troughs.

 

 

 

Furthermore, 17 air turbines of 15 KW each, placed on the wall near to the Solar Chimney will generate also electricity.

 

 

 

The air turbines will be forced to rotate by the incoming ambient air that is replacing the up-drafting warm air of the Greenhouse through the Solar Chimney.

 

 

 

It is estimated that the DEMO Hybrid power plant will generate approximately 9,000 MWh/year of electricity.

 

 

 

The demanded land for the DEMO Hybrid power plant will not be more than 100,000 m2 of which the 75,000m2 are for the Greenhouse and the rest for the solar chimney the thermal storage tanks and the steam turbine.

 

 

 

The estimated cost of the proposed HPVSC power plant is 7.0 million EUROs including the cost of detailed engineering studies, and supervision.

 

 

 

The main figures of the cost in thousand EUROs are:

 

 

 

  1. Greenhouse 75,000 m2 X 20 EURO/m2 =1,500

  2. PV panels of 2.5 MW X 550EURO/KW = 1,375

  3. Concrete Solar Chimney of 300 m3 X 1000 EURO/m3 =300

  4. 2,500 Troughs with receivers etc X 300EURO/Piece= 750

  5. Steam turbine etc of 1.5 MW X 800 EURO/KW= 1,200

  6. Thermal Storage tanks of 25 MWhth X 25,000 EURO/MWhth = 625

  7. Unforseen 250

  8. Engineering studies and supervision 1,000

 

 

 

 

 

 

 

 

 

Prof Christos D. Papageorgiou

 

PhD of Imperial College